/Engine/Source/Editor/UnrealEd/Public/Layers/LayersSubsystem.h
Adds the actor to the named layer.
true if the actor was added. false is returned if the actor already belongs to the layer.
virtual bool AddActorToLayer ( [AActor](API\Runtime\Engine\GameFramework\AActor) * Actor, const [FName](API\Runtime\Core\UObject\FName) & LayerName )